The average person who consumes 2,000 calories per day should eat approximately 250 grams of carbohydrates. One gram of carbohydrates is equal to four calories, which means that the average person should have 1,000 calories per day from carbohydrate sources.
Carbohydrates are the body's main source of energy. Once they enter the body, they are converted into glucose by the digestive system. Glucose provides the cells, organs and tissues of the body with energy. Any excess glucose that the body obtains from food becomes stored as glycogen in the liver and muscles. During times of fasting, the body can utilize the stored glycogen as glucose.